In recent years, the sustained and rapid economic growth in China has provided a huge market space for the wire and cable industry. According to incomplete statistics, China currently has more than 7000 various types of wire and cable manufacturing enterprises, with an annual output value of about 700 billion yuan. Although the output value is huge, but from the perspective of the development level of the entire industry, there are still problems of low industry concentration, decentralized technology, and low product technology content. Most types of cable products in the domestic market are in excess supply. China’s quality Wanli Bank discovered through unannounced visits that for profit and survival, a few manufacturers cut corners and materials, and poor quality wires and cables flood the market. Non-standard products are difficult to prohibit.
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The main problems of poor quality non-standard wire and cable are as follows:
1, 20 °C conductor resistance exceeded.
There are two main reasons: 1) The use of inferior copper materials, the relevant state regulations are clear, the copper wire of electric wire and cable should use electrolytic copper, and some companies use recycled copper or copper clad aluminum, copper clad iron, copper clad steel to impersonate copper. Regenerated copper impurities are too high and can easily cause excessive conductor resistance. 2) The wire diameter is too small. The smaller the wire diameter is, the smaller the actual cross-sectional area of ​​the wire diameter is than the nominal cross-sectional area. This is mainly due to the lack of strict control over the process of some production enterprises or due to cutting corners. Excessive conductor resistance, excessive heating of electrical wires, in addition to consuming large amounts of energy, more importantly, it is easy to cause fires and cause major disasters.
2. The tensile strength and elongation at break of the insulation and sheath are not up to the standard.
The insulating layer of the wire and cable is mainly used to prevent leakage and ensure safety. If a recycled or highly-impurified rubber (33100, -20.00, -0.06%) or plastic (11680, -265.00, -2.22%) is used as the insulating layer, its tensile strength and elongation at break are very difficult Meet the requirements of the standard. Insulation layer is not up to the standard wire and cable, easy to install insulation cracking, so that live conductor exposed, threatening personal and property safety. Such as the Hunan Provincial Bureau of Quality and Technology Supervision announced the label Hengyang Jinfu Wire and Cable Factory, Shanghai Huayi Electric Group Co., Ltd., Changsha City Jinheng Wire and Cable Co., Ltd., Hengyang Xiangnan Wire and Cable Factory and other products, before the aging test quality problems More prominent.
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